var mess = new 
Array('<img src="/images/no_1.gif" alt="NUMBER" width="120" height="80">','<img src="/images/no_2.gif" alt="NUMBER" width="120" height="80">','<img src="/images/no_3.gif" alt="NUMBER" width="120" height="80">','<img src="/images/no_4.gif" alt="NUMBER" width="120" height="80">','<img src="/images/no_5.gif" alt="NUMBER" width="120" height="80">','<img src="/images/no_6.gif" alt="NUMBER" width="120" height="80">','<img src="/images/no_7.gif" alt="NUMBER" width="120" height="80">');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);